Olympus E-M10 AF question

I recently upgrade from GF2 to E-M10. When I use GF2, there’s a function called Auto Focus lock or AF tracking. The function locks the target when it is moving. It is done by tap the target on the screen. A yellow box will lock the target and move with it. Is there a similar function for E-M10? If so where is it?

The OM-D cameras (including, I assume, the E-M10) have C-AF (continuous AF) and C-AF+Track modes, as well as a setting called C-AF LOCK which adjusts the sensitivity.
These are described athttp://biofos.com/mft/omd_em1_settings.html

I don't know if C-AF works in conjunction with the touch screen or not.